intel/compiler: Delete all the A64 atomic variants for type sizes

intel/compiler: Delete all the A64 atomic variants for type sizes

These are handled identically in almost all cases.  There is one place
in the legacy surface lowering that was obtaining the bitsize from the
opcode, but the LSC-based lowering uses (type_sz(inst->dst.type) * 8)
for that and works just fine.  If we just do that in the legacy lowering
too, then we don't need this plethora of opcodes.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Rohan Garg <rohan.garg@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20604>